I have a recent ktm 690 (smc). I've previously owned the enduro version. Anyway, sometimes when I'm riding I think about my spine and sit more 'upright' eg sort of like the red version but gradually without me realising I slump, and end up riding like the blue version: which is 'right'? I occasionally suffer from a poor lower back, but it's hard to tell if it's from my desk-job at work, or the way I ride my motorbike. What do you think is the right way to ride thumpers?